Question

A refrigerator is to maintain eatables kept inside at 7°C. The coefficient of performance of refrigerator if room temperature is 38°C is

• A. 15.5
• B. 16.3
• C. 20.1
• D. 9.03

Answer 1

Answer: (D)

9.03

Answer 2

Here, $\mathrm { T } _ { 1 } = 38 ^ { \circ } = 38 + 273 = 311 \mathrm {~K}$

$\therefore$ coefficient of performance of the refrigerator,

$= \frac { \mathrm { T } _ { 2 } } { \mathrm {~T} _ { 1 } - \mathrm { T } _ { 2 } } = \frac { 280 } { 311 - 280 } = 9.03$